21
Flow Rates
PIPE SIZE* MIN. GPM (lpm) MAX. GPM** (lpm)
* Must maintain minimum flow rate. Pipe size may further restrict flow.
Table M. Flow Rates
External Automatic Bypass Valve
An external automatic bypass valve is provided with
the heater. The bypass valve automatically responds to
BYPASS
VALVE
BYPASS
SPRING
Figure 17. External Automatic Bypass Valve
External Auxiliary Bypass Valve
rate. This valve is required to complement the function
of the automatic bypass valve, particularly when starting
the heater in winter or early spring when the spa or
eliminate needless pressure drop through the heater and
etc.
FROM HEATER
AUXILIARY BYPASS VALVE
(DO NOT USE GATE VALVE)
TO HEATER
TO POOL/SPA FROM POOL/SPA
Figure 18. Auxiliary Bypass Valve
Auxiliary Bypass Valve Adjustment
By Feeling The Inlet And Outlet Pipes At The Heater.
Comfortable To The Touch. If Pipe Is Hot, Close Bypass; If
Cold, Open Bypass.
Pressure Relief Valve Piping
The heater is supplied with a pressure relief valve, sized
The pressure relief valve outlet must be plumbed to a safe
point of discharge.
FIELD
SUPPLIED
FIELD
PRV
Figure 19. PRV Piping
NOTE: To avoid water damage or scalding due to valve
operation, drain pipe must be connected to valve outlet
and run to a safe place of discharge. Drain pipe must
be the same size as the valve discharge connection
throughout its entire length and must pitch downward
between the relief valve and the drain line. Valve lever
should be tripped at least once a year to ensure that
waterways are clear.
APPROVED
UNCONTROLLED DOCUMENT IF PRINTED
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